The heart and head of each, what screen
Was broken there to give them light,
While in ourselves it shuts the sight,
We should no more admire, perchance,
That these found truth out at a glance,
Than marvel how the bat discerns
Some pitch-dark cavern's fifty turns,
Led by a finer tact, a gift
He boasts, which other birds must shift
Without, and grope as best they can."